[PATCH] arm/linux-crt0.c: New file
Jeff Johnston
jjohnstn@redhat.com
Wed Jul 5 15:25:00 GMT 2006
Shaun Jackman wrote:
> This patch replaces the arm/linux-crt0 assembler source file with a C
> source file. Some inline assembler is used to switch to Thumb mode.
> The purpose of this patch is to allow the compiler to generate the
> correct relocation for environ when compiling PIC code. As a bonus,
> the C source file is also shorter and easier to read. Alright to
> commit?
>
Yes.
-- Jeff J.
> Cheers,
> Shaun
>
> 2006-06-29 Shaun Jackman <sjackman@gmail.com>
>
> * arm/linux-crt0.S: Remove file.
> * arm/linux-crt0.c: New file. Supports PIC code.
>
> --- /dev/null 2006-06-25 13:04:47.285393520 -0600
> +++ arm/linux-crt0.c 2006-06-29 11:43:50.000000000 -0600
> @@ -0,0 +1,39 @@
> +/** Linux startup code for the ARM processor.
> + * Written by Shaun Jackman <sjackman@gmail.com>.
> + * Copyright 2006 Pathway Connectivity
> + *
> + * Permission to use, copy, modify, and distribute this software
> + * is freely granted, provided that this notice is preserved.
> + */
> +
> +#include <stdlib.h>
> +#include <unistd.h>
> +
> +static int _main(int argc, char *argv[]) __attribute__((noreturn));
> +
> +#if __thumb__
> +asm("\n"
> + ".code 32\n"
> + ".global _start\n"
> + ".type _start, %function\n"
> + "_start:\n"
> + "\tadr r0, _start_thumb+1\n"
> + "\tbx r0\n"
> + ".size _start, .-_start\n");
> +
> +__attribute__((naked, used))
> +static void _start_thumb(void)
> +#else
> +__attribute__((naked))
> +void _start(void)
> +#endif
> +{
> + register int *sp asm("sp");
> + _main(*sp, (char **)(sp + 1));
> +}
> +
> +static int _main(int argc, char *argv[])
> +{
> + environ = argv + argc + 1;
> + exit(main(argc, argv, environ));
> +}
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